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The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis . 
Group A vertical column in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell.
Its chemistry is dominated by its tendency to lose an electron to form Be 2+ . As this ion is so small it is highly polarising, to the extent that its compounds are rather covalent. Its small size means that its complexes tend to be tetrahedral rahter than octahedral.